Truck-brake.



J. S. MUWHIRTER.

TRUCK BRAKE'.

.urmonxon rum Nov. 12. 190s.

Patented lA111'. 27, 1909.

Mymf

l.ionv s. Mcwniirriin, or

NEwNYoRK, N. Y.; AssieivoR roy THE J. BRILL ooMrANY, or'

"PHILADELPHIA, PENNSYLVANIA".

' Tnocirrnniin. j

Specification of Letters atent.

d Patented April 27, i909.

Application flediNovember 12, 1908. Serial No. 462,255l` To all whom itmay concern:

Be it known that l, loi-1N S. MCVHiRTnR, of the city, county, and Stateof New York, have invented a new and useful Improvement in Truck-Brakes,of which tlieffollowing is a specification. 1

The object of my invention is to provide a brake ofthis class whichwill'be suitable for trucks `with large drivingk and small trailingwheels, known as maximum traction trucks, which brake is so arranged anddis.

posed that when it is in "use, pressure will be applied to the wheels inproportion tothe Weight carried by them. This object Vis accomplished bymy invention, one embodi-v ment of which is described below.

For a more particular description ofyiny invention reference is to behad to the accompanying drawings, forming-a part hereof, in which theligure is aside elevationof my improved brake. Only one side is shown asthe other side is thesame in all` respects, so an illustration of oneside will an-swer for both. 4

wheels 4. For convenience the truck is only partially shown, and whatvis shown is shown in dotted lines. The truck 2 is provided with theusual side frame 5, crossings Gand 7 and a horizontal lever slide 8, allkof which may be of d the conventional construction. The truck also hasother parts which it is not `necessary to refer to in this case. y

The truck 1 is provided with a horizontal lever 9 resting on the slide Sand this'horizontallever 9 is connected at each end, in

the conventional manner, to an'upright'lever i 10 by means of a pivot11. .The lever ;10 is also fulcruined at 12 to a bell cranklever'13fulcrumed at 14 to a bracket 15 secured to the crossing 7. The bellcrank-lever 13 has the pivot 12 in an enlarged head 16 and this head 16is provided witha number of holes 17, as shown, all concentric withtheful' Crum 14. This lever 13 is fulcrume'dimmediately under theV crossing7 and has Aits longer arm extending upwardly-'and its upper endterminates at a pivot 18 secured to the brake shoe holder 19 which holdsa brake shoe 20 in the conventional manner,

' and presses the same' against a trailing wheel 4. The wear ofthebrake. shoe 20 can' be compensated for by shifting the pivot 12 v31vwhich is liXed to the crossing 6.

My improved brake 1 is applied toa truck- 2, with the driving wheels 3and trailing' `and means for supportingthe from one of said holes 17 toanother hole 17, as 1s obvious. i 'i The lower endf of the upright lever10 is pivoted to a'trunnion `21 extending from a sleeve 22sho'wnin'dotted lines ona nut 23 y whichA turnsjon an eye-bolt :24.11 vThe nut23 islocked in place by means ofl` a cotter, not shown, passing throughholes 25 in the bolt 24'and the registering slot-s 2.6.in the nut 23.

sion, the upper end of the upright lever 10 is shifted to theright'thereby forcing both ,v brake shoes 20 and 29 against theirrespective wheels. A reverse movement of the horizontal lever 9 willwithdraw these shoes from the wheels as isobvious. The location ofthetrunnion 21 and pivot 12, with regard to theyfulcrum 14 determinesthe relative pressure of the brake Shoes on the wheels. ln theconstruction shown, pressure is applied to ythe Vwheelsby the brakeshoes in proportion to theweights carried by them.

Vliile have shown and described onel embodiment of my invention, it isobvious that it is not restricted thereto, but is broad enough to coverall structures that come vwithin the scope of the annexed claims.

What I claim is: p

1. ln a device of the class described, an upright lever, a `bell cranklever pivoted thereto, a fulcrum for said bell crank lever, same, abrake slice holder carried by said bell crank lever, a second brake shoeholder, a trunnion pivotally connected to the uprightlever, and

`means for connecting said trunnion and said second brake shoe holderand Vmeans for supporting said last mentioned brake shoe holder.`

,2.` In a device of the class described, an

uprieht lever a bell crank lever and means for supporting the same, abrake slice `holder connected to said bell` crank lever, a second brakeshoe holder and means for supporting the saine, an eye-bolt secured tosaid last mentioned brake slice holder, a nut on said eye-bolt, a`collar on seid nut and a trunnion on said collar pivotally connectedwith Said upright lever.

3. In it device of the class described, an upright lever, e bell cranklever, a brake shoe holder carried by Said bell crank lever upon onelside of its ulcruln, a connection between said upright lever and thebell crank lever upon the opposite side of its fulcruin, a second brakeshoe holder, ineens for pivotally supporting the same, and ay screwconnection between the second brake shoe holder and the bell cranklever.

el. In it `device of the class described, an

upright lever, a bell crank lever, a brake shoe holder carried by saidbell crank lever upon one side of its fulcruni, :L connection betweensaid upright lever and the bell crank lever upon the opposite side ofits ulcrum, e second brake shoe holder, means for pivotnlly supportingthe suine, und :L

pivotal und screw connection between the second brake shoe holder :mdthe bell crunk lever.

Signed at the city, county and Stute of New York, this 10th day ofNovember, 1908.

lVitnesses Crus. A. Bnoons, lV. A. BUNCH.

